Bottom margin control for typewriters



1953 QUANG HSl HU ETAL 2,654,460

I BOTTOM MARGIN CONTROL FOR TYPEWRITERS Filed Oct. 27, 1949 .7 FIG. 5

FIG. 6- 39 JNVENTORS'.

QUANG HS/ HU & CH/N Y/ LEE {QM f/wuw Patented Oct. 6, 1.953

BOTTOM- MARGIN CONTROL FOR TYPEWRITERS Quang 1151 Hu and Chin Yi Lee, New York, N. Y.

Application October 27, 1949, Serial No. 123,838

Claims.

This invention relates to top and bottom margin contro1 devices for typewriters.

This invention is a continuation of the invention set forth in our co-pending patent application, Serial No. 112,944, filed August 29, 1949, now Patent No. 2,535,539, issued December 26, 1950, wherein there is set forth a bottom margin control device which will automatically prevent the further typing upon a sheet disposed within the typewriter when a predetermined locationhas been reached at the bottom thereof.

It is an object of the present invention to make refinements upon the prior bottom margin control device wherein upon the setting of the drop arm upon the paper it is relative to the bottom edge of the paper and is not dependent upon the manner in which the paper is placed'in the typewriter and wherein the drop arm and the support therefor is adjustable relative to the bottom edge of the paper, both being adjusted together and not as in the prior construction with the drop arm adjustable to the support and wherein the support does not need to be fixed or installed upon the typewriter chute.

It is another object of the present invention to provide on the support for the bottom of the paper sheet lined indications for any kind 'of spacing of typing, single, double or triple, so that the last line will exactly lie on the pre-set bottom margin, which is thus obtained precisely.

Other objects of the present invention are to provide a top and bottom margin control device for typewriters which is of simple construction, easy to operate and can be set by manipulation with two fingers, inexpensive to manufacture, self-contained and can be folded into a compact attachment, automatically controls the top margin along with the bottom margin, where the parts are so arranged that upon the return of the typewriter slide the impact at the end of the stroke will tend to be overcome by the angular movement of the parts of the arms to prevent the incidental disengagement 0r engagement of gears forming a part of the mechanism and efficient in operation.

For other objects and for a better understanding of the invention, reference may be had to the following detailed description taken in connection with the accompanying drawing, in which:

Fig. 1 is a side elevational view of the typewriter carriage and of the attachment embodying the features of the present invention with a paper sheet set in the typewriter carriage for operation.

Fig. 2 is a fragmentary plan view ofthe attachment.

Figs. 3, 4, 5 and 6 are respectively perspective views of the various parts of the adjusting arm and slide, Fig. 3 showing the slide and the finger, Fig. 4 showing the slide part containing the supporting arm, Fig. 5 showing the catch for the slides and Fig. 6 showing the spring for operating the catch. I

Referring now to the figures, i represents a typewriter roll which is mounted for rotation in a carriage 3. Extending upwardly at the rear of the carriage is a paper chute or inclined support 4.

In front of the typewriter roll I is the standard press roll 5. Keys 6 are disposed in the usual position in front of the roll and below these keys is the usual guide rule 1. Paper 8 is fed from the inclined support downwardly through the carriage and over the roll I. The bottom edge of the paper, at the beginning of the typing operation, extends upwardly from the typewriter chute 4. A frame 9 is secured to the carriage by screws 9a. A bracket 9b is fixed to the frame 9 by screws and has an upwardly and rearwardly bent portion 9d.

A small gear II is fixed to the typewriter roll and a large gear I2 is caused to be slid into engagement with the gear II in the manner set forth in detail in the above mentioned co-pending application in order to effect the driving of an indicating disc [3 which is observed after the control device has been operated to let the operator know the number of spaces which can be made thereafter to bring the typing within the predetermined bottom margin for the paper sheet.

When the gear I2 starts to operate, tension spring 28 connected to post It on the disc I3 is stretched. A pointer [5 will give the indication on the disc l3. An adjustable stop lever l8 can be adjusted at any time to vary the margin width to be desired after or before the gear I2 has been put in mesh with gear I I.

A radially extending arm [6a on shaft Hi to which gear I2 is fixed is connected to an arm lfla. of a rotatable structure l9. This structure I 9 is rotatable in a supporting sleeve 20. The rotatable structure l9 comprises two parts pivotally connected together by a pin lSd so that the upper part can be folded down forwardly when the device is not in use. A slide 22 is adjustable upon the rotatable structure I9 and this slide has a handle 23. A spring 24 urges the rotation of the rotatable structure in a counterclockwise direction, as viewed in Fig. 2, and causes the shifting of the shaft 16 inwardly, as viewed in Fig. 1. This spring 24 is connected ally extending member 21 and an adjustable part 21a pivotally connected at 21b to the laterally extending part 27 which is in turn fastened-to slide block as. It will be noted that this pa er support 26 is not in anyway attached to the paper chute 4 as in the prior construction.

The adjustable part 210. has diiferent sets of indications. single spacings, the larger indications 26o indicate the double spacings, while the indications 260 at the opposite side of the part 210. give the triple space spacings. However, all indications, 26a, 26b and 260 are good for single spacing. The indications on the disc l3 of the lines left will also be given in' single, double and triple spacings.

The lower end of the paper support part 21a has a shape similar to a hook with a recess 26d over which the ball formation 25a of the finger 25 is supported when the paper is lying upon the paper support 26. The part 21 also has a recess underlying the recess 2611. As the bottom edge of the paper 8 passes downwardly under the bail 25a of the finger 25, the ball 25a will pass through the recesses to permit the rotation of the rotatable structure I9. This paper sheet 6 lies between the finger '25 and the support 26 to normally support finger 25 until the edge of the sheet is reached.

The outer end of the arm 21 is recessed, as indicated at 210, to receive the hooked lower end 'of the adjustable sup-porting part 21a. The'lower end of the part 21 1. has a straight edge 21d adapted to fit against the shoulder on the part 27 afforded by the recess 21c whereby to hold the part 2701. in its vertically extended position. Below this straight edge 21d is a curved edge me and below this is a straight edge 21]. -'When the straig l'lt edge 21f engages the shoulder provided by the recess 210 of the part 21, the part 21a will be held in a horizontally extended position.

The arm 19a has a striker lab which will strike bell so when the finger 25 is released from the bottom edge of the paper sheet 8. Guide plate 29 receives the tension spring 28 as the gear I2 and indicator disc i3 is rotated. The post 14 on the disc ['3 will normally rest upon the frame stop block 33 and as disc I 3 rotates it will come to rest against the adjustable stop 18a. whereby to prevent any further rotation of the typewriter roll I and determine the bottom margin line to be made on the sheet. A hook'34 can be extended over a fixed sleeve H on the shaft IS The indications 26a indicate the whereby to hold the gear l2 out of operation 55 when the device is not in use. 7

Pivotally adjustable about a pin '35!) on the inclined portion 9d of the bracket 97? is an arm extension 35;. The bracket arm 9d and the arm extension 35 are notched on the under sides, as indicated at 35a. When the device is not in use, the arm extension 35 can be pivoted forwardly about pivot pin 35b. The paper support -26 further includes a slide block 36. This slide block has a recess'36a, Fig.

4 4, for receiving the bracket arm 9d and the arm extension 35 and to permit the adjustment of the slide block 36 thereover. The slide block 36 has upstanding extensions 36b and 360 receiving depending projections 22b and 220 of the slide 22. The depending projections 22b and 220 of the slide 22 can swing between the projections 36b a d .359 which will permitthe ,pivotable structure I!) to pivot in its sleeve 'supportm; 10

A retaining member?! is pivotallyconnected to the lower end of the slide block 36 by a pin 38. This retaining element has at one end a projectlon 3Tb adapted to enter any one of the notches 35a on the bracket arm 9d and arm extension 35. The notches 35a are disposed one quarter or an inch apart. A retaining spring 39 Of U shape is disposed in one end of the retaining element 3! and is so shaped and constructed as to keep the retaining element 39 pivoted to urge the projection 31b toward the notches 35a. The spring 39 will lie within the upstanding portion 310 of the retaining element. The paper support 26 being connected with the slide block 36 and the slide block being con:- nected with the slide 22 for adjusting the finger 25, both the paper support 26 and the finger 25 will be accordingly adjusted together when making the settings for the different margins to be left at the bottom of the sheets. The paper support 26 will be adjusted to the different distances on the bracket arm 9d and the arm extension 35. -By grasping the handle 23 and pivoting the slide 22, the finger 25 can be lifted. To move the slides, the operator depresses the retaining element 3! to disengage the tooth projection 37b from the notch. She will then move the whole assembly along the arm 35 to the desired bottom margin setting. She then releases the retaining element to fix the assembly in the adjusted position and to re-e'ngage the projection 51b into one of the notches 35a. The handle 23 can be tightened, if necessary, to fix the slide '22 to the pivotable structure l9.

The successive paper sheets of the same size, when inserted, can be easily brought to the same top margin by observing the location of the bot, tom edge upon the indications on part 21a to start typing each time. To be-certain that the last line will fall at'exactly the preset margin, the bottom edge of the paper sheet is placed in line with the indications 25a, 26b or 260 depending on whether sing'le, double or triple spacings are, to be used.

With the paper support 25 being adjustable with the finger'25 and with the bottom edge 'being aligned with the indications on part 2141, the bottom margin is accurately obtained and the last typed line will exactly lie at the preset dis-L tance from the bottom edge; The last line will fall exactly at the preset margin for any kind of typing spacing. The finger '25 will be well supported up to the edge of the sheet and upon being released will move gear 2 into engagement with gear I! so that the disc 13 with 'the stop post My thereon is rotated until the post It.

comes-into .eneasementwith the adjustable stop lever is. A that tim further movement oi the roller is positively prevented! v If the paper support part 210. is angularly ad,-. lins ed relative to the part 21, the finger 25 will be supported enthe support. 26 and keeps he device from functioning. The :pivotable. structture is has its ma s so s ibuted that it will tend to keep, the sears -l-!'-and =12 inrmesh. asthe typewriter carriage is jolted at the ends of its travel.

While various changes may be made in the detail construction, it shall be understood that such changes shall be within the spirit and scope of the present invention as defined by the appended claims.

What is claimed is:

1. In combination, a typewriter carriage, a

typing roll rotatable upon the carriage, said typing roll being adapted to receive a paper sheet, a bottom margin control device mounted on the carriage and associated with the typing roll to stop the rotation of the same upon the predetermined bottom margin of the paper sheet being reached, said bottom margin control device including a support mounted on one end of the carriage, an adjustable paper supporting arm extending laterally upon the support and vertically adjustable thereupon for supporting the bottom of the paper sheet and a trip finger pivotally carried upon the support and associated with said paper supporting arm for release upon the paper bottom edge passing from the paper supporting arm, said trip finger serving to put into operation the device to stop rotation of the typing roll, said supporting arm having single,

double and triple space indications on which the bottom edge of the paper sheet may be placed to start typing whereby to make certain that the last line will fall exactly at the preset bottom margin.

2. In combination, a typewriter carriage, a typing roll rotatable upon the carriage, said typing roll being adapted to receive a paper sheet, a bottom margin control device mounted upon the carriage and associated with the typing roll to stop the rotation of the same upon the preselected bottom margin of the paper sheet being reached, said bottom margin control device including a frame connected to the carriage, normally fixed elements on the frame adapted to be driven when released after a predetermined number of spacings of the typing roll to cause the typing roll to be stopped, a pivotal structure extending upwardly from the frame and operable upon the elements to release them and to initiate their action including arm means extending upwardly from the frame and pivotable thereon, a slide with a finger thereon adjustable on said pivotable arm means, fixed arm means extending upwardly from the frame, a slide block adjustable upon the fixed arm means, said slide block having a paper supporting arm thereon,

said slide block being adjustable to permit the release of the finger of the pivotal arm means at different distances from the line of typing of the paper sheet, said finger adapted to rest on the paper sheet and adapted to drop from the bottom edge of the paper sheet through the paper supporting arm upon the paper sheet having moved from under the finger.

3. The combination as defined in claim 2, said fixed arm means for the slide block having a plurality of spaced notches, a retaining element adjustable upon the slide block and having a projection adapted to engage any one of the notches on the arm means whereby to retain the slide block in its adjusted position thereupon, said slide upon the pivotable, arm means engaging with the slide block to be adjusted therewith.

4. The combination as defined in claim 2, said slide block being releasably retained upon the fixed arm means, said slide upon the pivotable arm means having portions engageable with the slide block on the fixed arm means to permit the pivotal movement of the pivotable arm means, but allowing the slide to be adjusted upon the pivotable arm means as the slide block is adjusted upon the fixed arm means for the different margin settings, said pivotable arm means having an arm extension which can be piVOtBd forwardly to an out-of-use position, said finger slide being adjustable upon the arm extension and releasable from the slide block of the fixed arm means when the arm extension of the pivotable arm means is moved to the out-of-use position, and a handle screw adjustable upon the slide to fix the slide to the arm extension.

5. The combination as defined in claim 2, said paper supporting arm comprising a laterallyextending part connected to the slide block on the fixed arm means, an adjustable supporting part pivotally connected to the laterally-extending part to be adjusted between vertical and horizontal positions, said parts having recesses which are aligned when the adjustable part is in the vertically extending position, said finger adapted to pass through the aligned recesses of said part upon the paper sheet being drawn from under the finger, the adjustable part upon being adjusted to its out-of-use position to place the recesses of the parts out of alignment and to cause the finger to be supported by the parts.

QUANG HSI HU. CHIN YI LEE.

No references cited. 

